Which polyatomic ion is found in the compound represented by the formula nahco3? (1) acetate (3) hydrogen sulfate (2) hydrogen carbonate (4) oxalate any explanation for this question?

Polar bears give birth and hunt on sea ice. which of the following would polar bears survive during the melting of arctic ice? growing another layer of fur during summer migrate inland to search for different food sources staying put until the ice refreezes sticking to the usual diet of seals